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I am converting one garage bay into a workshop. I have insulated the walls, and sealed off the workshop from the rest of the garage with a stud wall, insulation and 1/2″ rigid foil faced foam boards. I would like to preserve the headroom I have, and so would like to insulate the rafter bays. I’m uncertain as to how to proceed, but have considered the following possibilities:
1. Fill the rafter bays full with bats, and then put 1/2″ foil faced insulation boards across the rafters, and tape seams.
2. Fill the bays with , but leave an air gap. Cover rafters with 1/2″ foil faced insulation boards and tape seams.
3. Call in a insulation foam contractor and spray in either an inch or so of foam and the rest with , or just fill it all with foam. I have a feeling, though, this option would get too expensive for me.
The shop is under the hip part of the roof, and there is no good way that I can see to ventilate the rafter bays. If I fill the bays full of , and tape the rigid foam boards, would this create a good air seal and would negate the need to ventilate ? By the way, I live in the Houston, Texas area.
As a matter of fact, why exactly do you need to leave an air gap ?
Any advice is greatly appreciated !
Replies
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I am converting one garage bay into a workshop. I have insulated the walls, and sealed off the workshop from the rest of the garage with a stud wall, insulation and 1/2" rigid foil faced foam boards. I would like to preserve the headroom I have, and so would like to insulate the rafter bays. I'm uncertain as to how to proceed, but have considered the following possibilities:
1. Fill the rafter bays full with bats, and then put 1/2" foil faced insulation boards across the rafters, and tape seams.
2. Fill the bays with , but leave an air gap. Cover rafters with 1/2" foil faced insulation boards and tape seams.
3. Call in a insulation foam contractor and spray in either an inch or so of foam and the rest with , or just fill it all with foam. I have a feeling, though, this option would get too expensive for me.
The shop is under the hip part of the roof, and there is no good way that I can see to ventilate the rafter bays. If I fill the bays full of , and tape the rigid foam boards, would this create a good air seal and would negate the need to ventilate ? By the way, I live in the Houston, Texas area.
As a matter of fact, why exactly do you need to leave an air gap ?
Any advice is greatly appreciated !